For example, if there were SUSPICIONS that there were grounds for removal under the 25th Amendment, it would PROBABLY be the FBI (or maybe another appropriate DOJ agency) that would do the formal investigation. So, it would be the FBI's reports that would be submitted to SUBSTANTIATE any execution of those 25th Amendment powers.

It is unlikely that a VP, and/or the Cabinet would do the formal investigations THEMSELVES personally. And even Congress, while legislators TALK about investigating this and investigating that, I suspect much of the ACTUAL work involved is through various DOJ agencies.

You're assuming only CRIMES would be the reason for using the 25th and that is pretty much exactly WRONG. Impeachment is that avenue. The 25th is more intended for reasons such a health or mental... more